Author Topic: High Pressure Steam Table Engine  (Read 9500 times)

Offline Admiral_dk

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Re: High Pressure Steam Table Engine
« Reply #165 on: September 20, 2022, 03:51:34 PM »
That was a Cheeky way of 'making them long enough' .... I would have worried that I also had 'glued the gauge' together with the bushings ....

Great to see progress again Jo  :cheers:

Per

Offline Jo

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Re: High Pressure Steam Table Engine
« Reply #166 on: September 20, 2022, 04:49:23 PM »
Thank you Per  :)

To finish off for today I did a bit more boring:



As I got close it was not good enough to measure with a Vernier so out came the telescoping gauges and the micrometre:



And finally the plug gauge fits



Having checked the fit of the bearings both in the stands and around the crankshaft it can go together:



The gap on the base is not wide enough for the bearing stand  :Doh:

Enough for today, other things are calling me  :mischief: How did I ever get enough time to go to work  :headscratch:

Jo
Enjoyment is more important than achievement.

Offline bent

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Re: High Pressure Steam Table Engine
« Reply #167 on: September 20, 2022, 06:27:57 PM »
Thanks for the lessons in fabricating split bearings...I'd not seen that before.  :popcorn:

Offline Roger B

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Re: High Pressure Steam Table Engine
« Reply #168 on: September 20, 2022, 07:08:55 PM »
So many little unique features  :)  :)  :wine1:
Best regards

Roger

Offline Michael S.

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Re: High Pressure Steam Table Engine
« Reply #169 on: September 20, 2022, 07:27:26 PM »
now I see my mistake.
The upper part of the bearing has so much oversize that the cast attachment for the oil cup still comes out.
A nice job.

Michael

Offline Jo

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Re: High Pressure Steam Table Engine
« Reply #170 on: September 22, 2022, 04:24:12 PM »
Thanks Guys  :)

The crank comes as a casting:



The first thing is to mount it up in a three jaw and get it mounted parallel - remembering that the circular bosses are actually tapered so we need to check against something parallel:



Then we can face the central boss:



And as expected the little dimple in the centre of the boss was not central  :ShakeHead: We need to drill deep to make sure our subsequent drilling follows the centre and not that dimple:



Having drilled and reamed it to size it can now be mounted on the hole on an expanding mandrel and the bottom faces both machined flat:



Now we can take the mounting mandrel and casting over to the milling machine, having clamped it square, find the centre of the hole with an edge finder:



Then use a pointer to move up to the correct throw distance then tap the casting to centre it on the little end:



Now it can be drilled and reamed:



We have the holes:



Now we can take the two bosses to distance:



You can see the hole drilled from the rear came out in the centre of the big end boss from this shot while the crank was rotating on the mandrel:



Mounted onto the crankshaft we find:



It hits the side of the hole in the bottom casting  :wallbang:

Jo


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Offline Charles Lamont

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Re: High Pressure Steam Table Engine
« Reply #171 on: September 22, 2022, 04:58:50 PM »
Jo - I think you will find it goes the other way round.

Offline Jasonb

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Re: High Pressure Steam Table Engine
« Reply #172 on: September 22, 2022, 05:05:45 PM »
Indeed as the conrod will otherwise hit the crankshaft end as it is in the photo

Offline crueby

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Re: High Pressure Steam Table Engine
« Reply #173 on: September 22, 2022, 05:42:01 PM »


Offline Admiral_dk

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Re: High Pressure Steam Table Engine
« Reply #174 on: September 22, 2022, 07:31:40 PM »
Nice and very instructional post as usual Jo  :ThumbsUp:

And the little 180 wrong placement is another thing most off us can relate to (one way or another)  :-X

Per

Offline Jo

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Re: High Pressure Steam Table Engine
« Reply #175 on: September 22, 2022, 08:11:42 PM »
Oh good someone is actually watching the build  :LittleDevil:


Jo
Enjoyment is more important than achievement.

Offline Jasonb

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Re: High Pressure Steam Table Engine
« Reply #176 on: September 22, 2022, 08:44:13 PM »
It will be interesting to see where the crank pin falls when it is the right way round, looking at the drawings even if fitted as in your photo it should have had 3/32" clearance.

Though the way the ctr line of the pedestal is dimensioned off the side of the cutout is not a good way to do it. Would have been better dimensioned from the engine ctr line or at least how far offset from the column ctrs

Online steam guy willy

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Re: High Pressure Steam Table Engine
« Reply #177 on: September 23, 2022, 02:10:27 AM »
Hi "JO" , just catching up with this build ....looking good and some of those castings look really lovely and well detailed . An interesting engine and will be interesting to seeing it in motion...
"W" :ThumbsUp: :popcorn:

Offline Dave Otto

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Re: High Pressure Steam Table Engine
« Reply #178 on: September 23, 2022, 05:03:03 PM »
Good to see progress Jo!


Dave